We have IAD at our club and its still very much alive and kicking. (funny to watch people bicycle kick their way to deployment)

At our club its cheaper on paper but costs about the same cause of the failed HARTs and turns ect. The one downside it does have is we have a limited amount of student rigs and that plays a huge part into how much you will get to jump, the AFF students use the same rigs but then again you only need to deal with that 7 times during your progression.

But to the point of the costs involved that is a major reason why alot of our students are IAD.